What finishes off lazy bistro who’ll cook egg only partly (4)
I believe the answer is:
yolk
'egg only partly' is the definition.
I can't judge whether this defines the answer.
'what finishes off lazy bistro who'll cook' is the wordplay.
'what finishes off' indicates one should take the final letters (the letter that finishes off the word).
The last letters of 'lazy bistro wholl cook' are 'YOLK'.
Can you help me to learn more?
(Other definitions for yolk that I've seen before include "Yellow (as opposed to white?)" , "Egg's "yellow"" , "something attractive to soldiers?" , "Part of a 7 Down" , "Soldiers go in here" .)